TV Tuner Software

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I am using Ubuntu 9.10. I have downloaded MythTV frontend and attempted installing and using Hauppage USB WinTv -HVR 950Q tuner. On TVTime I get "no signal". I attempt configuring source but ge nowhere.
I have used MythTv backend to set up tuner. It recognizes the tuner, but when I select "Watch TV" I get the message: "Error: MythTV is using all inputs but there are no active recordings?" Any help out there?
(HowTos)